I have the Contours stroller, it's a tandem stroller with ability to use diff car seats as well as the seats that it comes with. It's fairly light, not too huge... Maneuvers pretty well. I found it by looking on lucieslist.com. She compares/contrasts everything baby gear you could imagine and gives you her top choices. Good luck!

I second the Contours Options Stoller!! It's the best! It drives soo smooth and u have the option to switch the seats in different positions and is sturdy. I have a 3 month old and a 20 month old and they really like it.

I really love the britax b ready stroller. I don't have it but I recently found one on bookoo for $300 which is really good for them. I have used one and love the weight of it and that it's a tandem stroller. It's good for long walks. I do baby wear though a lot because we live in Germany and it's easier to do that than try to cart the stroller everywhere.